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1 | # Usage |
2 | ||
3 | rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects. | |
4 | ||
5 | Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`prepare.sh` and `build.sh` or `test.sh`). | |
6 | ||
7 | ## Cargo | |
8 | ||
9 | In the directory with your project (where you can do the usual `cargo build`), run: | |
10 | ||
11 | ```bash | |
12 | $ $cg_clif_dir/build/cargo.sh build | |
13 | ``` | |
14 | ||
15 | This will build your project with rustc_codegen_cranelift instead of the usual LLVM backend. | |
16 | ||
17 | ## Rustc | |
18 | ||
19 | > You should prefer using the Cargo method. | |
20 | ||
21 | ```bash | |
22 | $ $cg_clif_dir/build/bin/cg_clif my_crate.rs | |
23 | ``` | |
24 | ||
25 | ## Jit mode | |
26 | ||
27 | In jit mode cg_clif will immediately execute your code without creating an executable file. | |
28 | ||
29 | > This requires all dependencies to be available as dynamic library. | |
30 | > The jit mode will probably need cargo integration to make this possible. | |
31 | ||
32 | ```bash | |
33 | $ $cg_clif_dir/build/cargo.sh jit | |
34 | ``` | |
35 | ||
36 | or | |
37 | ||
38 | ```bash | |
39 | $ $cg_clif_dir/build/bin/cg_clif -Cllvm-args=mode=jit -Cprefer-dynamic my_crate.rs | |
40 | ``` | |
41 | ||
42 | There is also an experimental lazy jit mode. In this mode functions are only compiled once they are | |
43 | first called. It currently does not work with multi-threaded programs. When a not yet compiled | |
44 | function is called from another thread than the main thread, you will get an ICE. | |
45 | ||
46 | ```bash | |
47 | $ $cg_clif_dir/build/cargo.sh lazy-jit | |
48 | ``` | |
49 | ||
50 | ## Shell | |
51 | ||
52 | These are a few functions that allow you to easily run rust code from the shell using cg_clif as jit. | |
53 | ||
54 | ```bash | |
55 | function jit_naked() { | |
56 | echo "$@" | $cg_clif_dir/build/bin/cg_clif - -Cllvm-args=mode=jit -Cprefer-dynamic | |
57 | } | |
58 | ||
59 | function jit() { | |
60 | jit_naked "fn main() { $@ }" | |
61 | } | |
62 | ||
63 | function jit_calc() { | |
64 | jit 'println!("0x{:x}", ' $@ ');'; | |
65 | } | |
66 | ``` |